Mr. James deposited 2 checks into his checking account, one for $280 and one for $90. Later that day he withdraw $150 at an ATM. At the end of the day his balance was $645. What was his balance at the beginning of the day?

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =